Hi Mike @birdcircus ,
That won’t work, because of the Buttons and Screen that are ‘in the way’ (they are not at the bottom, so that’s why it does work there).
I really recommend trying it and see what goes wrong!
This:

is called Z-fighting and it happens when two Faces are in the same place. (The large one, made by your suggested method and the ‘cross’); Blender (or any 3D software) doesn’t know what Face to render.